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For my current application I use a very simple scheme to register new users. When a new user registers an email is sent with a key. To check wether this key is correct a kind of checksum is computed (3-7-11 digit check) which is added as the last 2 digits of the key. There is no check on any further validity of the key. The application does not check whether the key got invalidated. It is a simple scheme and someone took the time to crack it by deassembling the code. I want to use another scheme for my new application but I am not sure what is the best way to do this. Is there a Delphi library I could use? Is it advisable to use some user supplied info in the key, like his name? Is there a best practice way of registering users? Anything else I have forgotten? Some registration schemes require an application to check each time at a webserver whether the key is still valid. I'd rather not go that far because this requires a lot of effort on the server side. Any suggestion or link for a robust way to register new users is very welcome.

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